A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China Author Smith, Sarah M. Department of Entomology, Michigan State University, 288 Farm Lane, East Lansing, Michigan 48824, USA https://orcid.org/0000-0002-5173-3736 camptocerus@gmail.com Author Beaver, Roger A. 161 / 2 Mu 5, Soi Wat Pranon, T. Donkaew, A. Maerim, Chiangmai 50180, Thailand Author Cognato, Anthony I. Department of Entomology, Michigan State University, 288 Farm Lane, East Lansing, Michigan 48824, USA text ZooKeys 2020 983 1 442 http://dx.doi.org/10.3897/zookeys.983.52630 journal article http://dx.doi.org/10.3897/zookeys.983.52630 1313-2970-983-1 7DED4CE2934C4539945F758930C927F9 C890C7FD4B2D57A8B1A062305ED42D53 Webbia Hopkins, 1915 Webbia Hopkins, 1915b: 222. Xelyborus Schedl, 1939a: 349. Synonymy: Browne 1963 : 57. Prowebbia Browne, 1962: 208. Synonymy: Browne 1972 : 25. Type species. Webbia dipterocarpi Hopkins, 1915b; original designation. Diagnosis. 1.9-3.4 mm long, 2.6-3.75 x as long as wide. Webbia is distinguished by the scutellum not apparent; dense tuft of setae present along elytral base associated with an elytral mycangium; antennal funicle 2-segmented; protibiae slender, outer margin armed with more than nine denticles, posterior face inflated and unarmed; pronotum conspicuously elongated, rectangular in dorsal aspect, disc flat, anterolateral corners inflated (type a in dorsal view); elytra with few setae, abruptly truncated and often elaborately ornamented with large projections. Similar genera. Amasa , Arixyleborus , Cyclorhipidion , Pseudowebbia . Distribution. Throughout the Paleotropics. Gallery system. The unbranched radial entrance tunnel leads to a single large brood chamber in the longitudinal plane ( Browne 1961b ). Remarks. The majority of species are strongly associated with Dipterocarpaceae , but single species are specialized on Fagaceae and Sapotaceae ( Browne 1961b ).